Methods to enhance the properties of tial intermetallic compounds
An intermetallic compound and performance technology, applied in the enhancement field of TiAl intermetallic compounds, can solve the problems of uneven strength and segregation, and achieve the effects of increased strength, stable process and uniform structure
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Embodiment 1
[0012] Cast TiAl 5kg, crushed by a jaw crusher for 10 hours, and the crushing process was divided into three stages, and passed through an 80-mesh sieve to obtain TiAl powder; ball milled the TiAl powder for 70 hours, and then sieved 200 mesh to obtain TiAl fine powder; TiAl Fine powder, 0.375kg C powder, and 0.875kg Si powder were mixed evenly, and high-energy mechanical alloying was carried out for 72hrs to obtain composite powder; the composite powder was sintered by hot pressing at 1000-1500°C and 10MPa to obtain in-situ SiC reinforced TiAl composite material. The tensile strength is increased from 400MPa to 450MPa, the fracture toughness is increased by 10%, and the brittleness is improved.
Embodiment 2
[0014] Cast TiAl 5 kg, crushed by a jaw crusher for 12 hr, and passed through an 80-mesh sieve. The above powder was ball milled for 72 hrs, and passed through a 200-mesh sieve. The obtained TiAl fine powder, 0.225 kg C powder and 0.525 kg Si powder were uniformly mixed, and then high-energy mechanical alloying was performed for 72 hr. The obtained alloy powder was hot-pressed and sintered at 1200° C. for 2.5 hr at a pressure of 12 MPa to obtain a SiC-reinforced TiAl composite material.
[0015] The tensile strength of the composite material is increased from 400MPa to 440MPa, the fracture toughness is increased by 10%, and the brittleness is improved.
Embodiment 3
[0017] Cast TiAl 4 kg, crushed by a jaw crusher for 10 hr, and passed through an 80-mesh sieve. The above powder was ball milled for 70 hrs, and passed through a 200-mesh sieve. The obtained TiAl fine powder, 0.3 kg C powder and 0.7 kg Si powder were evenly mixed, and then high-energy mechanical alloying was performed for 70 hr. The obtained alloy powder was hot-pressed and sintered at 1200°C for 2.0 hr at a pressure of 10 MPa to obtain a SiC-reinforced TiAl composite material.
[0018] The tensile strength of the composite material is increased from 400 MPa to 500 MPa, the fracture toughness is increased by 10%, and the brittleness is improved.
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